class_docstr: Base class for SVM.
code: def __str__(self) -> str:
      rows = ["TreeEnsemble", f"root_index={self.root_index}", str(self.atts)]  # type: ignore
      return "\n".join(rows)
  
file_path: onnx/onnx/reference/ops/aionnxml/op_svm_helper.py
imports: from typing import Any
  import numpy
label_desc: Use image node_id 2 for calling the SVMCommon obj's underlying member method code with example usage: obj.__str__() and returns: str